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(No Model.) l E. C. iTATUM, Jr.

SEWING MACHINE EMME. E No. 293,109. Patented Eeb. 5, 1884.

Z yf x a zzrfezzaz" LMI VUNITITD STATES PATENT OFFICEo sAMUnI. o.rArUII, Jn., or CINCINNATI, oIIIo, AssIGNon To s. o. TATUM a CO., OFSAME PLAGE.

sewlNeMAcHlNe FRAME.

l v f. SPECIFICATION forming part of Letters Patent No. 293,109, datedFebruary 5, 1884. Applicationlled November 24, 1383. (Xo model.)

To @ZZ whom it may concern.-

Be it known that I, SAMUEL TATUM, J r., a citizen of the United States,and a resident of Cincinnati, in the county of Hamilton `and State ofOhio, have invented certain new and useful Improvements in SewingMachine Frames, of which the following is a specification.

. My invention refers more particularly to the method of constructingthe frames for mounting the driving-wheel and arranging the parts inconnection therewith.

The object of my invention is, first, .to construct the frame so thatthe drivin gwheel may be journaled on adjustable centers, and providedwith mechanism for allowing the wheel to be driven forward, and yetprevented from i being driven backward by a treadle movement.

Another object of my invention is to com-1 bine one of the armssupporting the adjustable center journals with the frame of the machine,so as to form a guard or dress-protector.

The various features of my improvement willbe fullyset forth in thedescription of the accompanying drawings, in which- Figurelrepresents aperspective view of my improvement attached to one end of a skeletonframe. Fig. 2 is an elevation of the driv ing-wheel with my improvedratchet-center. Fig. 3 is a section on line a: x, Figs. l and 2. Fig. 4is an elevation of t-he st'opdevice with the ratchet in section. Fig. 5is acentral sectional view of the same, but showing the ratchetconnected to the driving-wheel.

AAreprescnt the posts of the frame; a, the legs; a, the top fiange towhich the table is secured. j

b b represent cross-arms connecting posts A A near their center, so asto form a journalsupport for the driving-wheel.

B represents the driving-wheel.

'c represents a balance or weighted ring.

`l) represents t-he band-rim.

d represents spider-arms forming the center, and connected to the rims Cand D.

E represents a serrated hub or boss formed upon the inner central faceof the spider d.

e represents a conical groove for center F.

The periphery of the boss E is preferably made with ratchet-shapedteeth;butserrations .5o of any form may be used with a less degree ofefficiency.

G represents a boss or disksl1aped projeetion, preferably cast on andwith the arms l), as shown in Fig. l. It is provided with an ec- 5"`5centric or scroll-shaped orifice, as shown in Figs. 1 and 4, theconcentric portion of which opening is made sufficiently large to allowthe boss or ratchet E to freely revolve therein, and the eccentricportion is sufficiently large to 6o allow the loose pin or roller h towork therein, and is provided with an abrupt stop, as illusn trated inFig. 4. against which the pin rests and is kept by the forwardrevolution of the driving-wheel.

F H represent center bearings, one of which taps through the arm I, andthe other through boss G, east with the arms b.

f represents set or jam nuts for securing the adjust-able centers F Hinany desired fixed po- 7o sition.

K represents a crank-arm connected at one end to thecrank-pin L. Thelower end of the crank-ar1n is provided with a conical-shaped socket toreceive the center H, which forms one of the axial journals of thedriving-wheel.

M represents a shield cast on and with the arm I, and with theframe-post A, and it forms a very rm, rigid support for the outer journal of the driving-wheel, and it is projected above and below theplanes of the arm I a sufcient distance to form a shield ordress-protector. It is preferably made of oval form upon the exterior,the interior being concentric with the rim C of the driving-wheel,forni-V 8 ing at once a symmetrical and rm journalsupport and anefficient dress-guard.

The mode of operation of the driving parts is as follows: Thedriving-wheel is adjusted on the centers F H, as shown in Fig. 3. Theset- A screwsf j'.` are adjusted so as to `prevent' any lateral movementof the drivingwheel on its centers. The pin h is placed in the eccentricoutside of the boss E, as shown in Fig. 4, and when the wheel isrevolved forward the pin h will be kept or forced up against its stop,and a free revolution of the driving-wheel is obtained by a treadlemovement in the ordinary manner. A reverse motion or" the crank-armcauses the pin h to be carried down in the eccentric slot until it iscaught between the serrated boss E and the outer periphery of thiseccentric slot G, and the backward movement of the crank and drivingWheelis arrested.

Having thus described my improvement, what I claim as my inventionis- 1. In combination With the centers F II and driving-Wheel B, theboss G, having the concentric opening, serrated boss E, and stop-pin h,substantially as lierein set forth.

2. In combination with the frame A A', the boss G, adjustable center F,adapted to receive the stop E, and pin h, substantially as herein setforth.

3. In combination with the driving-wheel B,

l crank K, and Wrist-pin L, the serrated boss E,

forming a center .for a journal-support and secured to the arms of thed1iving-\vlieel, substantially as herein set forth.

4. A lock or stop motion for a sewingma chine, composed, essentially, ofthe serrated boss E, secured to the driving-Wheel, and the hub G,secured to the frame, provided with an eccentric central opening`adapted to receive the boss E, and pin 71 substantially as herein setforth.

5. The shield M, cast integral with the post A of the frame, and withthe arrn I, Which serves as a ]our1ial-support, substantially as shownand described.

In testimony whereof I have hereunto set my hand.

SAM. C. TATUM, JR.

Witnesses:

ANDREW E. Scorr, A. GL'UeHoWsKY.

